Windows Insider Program's 5 million members will get Windows 10 first on July 29

Microsoft continues to see growth in its Windows Insider program. The number of members that help test Windows 10 and Windows 10 Mobile has now reached 5 million people, according to a new update from Microsoft's Windows and Devices head Terry Myerson.

The last update on Windows Insider member numbers was made in mid-May, when Microsoft stated there were 3.9 million people in the program. As revealed earlier today, those Windows Insiders will the first consumers to have their Windows 7 or 8.1 PC to get the free upgrade to Windows 10 when it begins rolling out on July 29. People who are not signed up with the program may have to wait until sometime after that date to download the free upgrade. Windows Insiders will also continue to get updates to Windows 10 after July 29 to test before they are released to the general public.